Dissociative Sedation and analgesia described by Robert and Rosebaum in 1971 is____________? July 28, 2019 – by admin Dissociative Sedation and analgesia described by Robert and Rosebaum in 1971 is____________? A. 5 to 20% N20 B. 20 to 30% N20 C. 30 to 50% N20D. 50 to 70% N20